ARTHROPODA ^hylum vii 



77 . .h^inU The Ollis are typically in several series attached 



'^\^cl.^^CZ,lf^^^ forerunners of this lavge and va.ied order. 

 Suborder A. NATANTIA Boas. 



aMoul Z2ch Jdler tLn the others. Leg. shnder, someH^es mlh «opodtcs 

 ttyoTe oT'hTfirst three fain r.ay U enUrged. AMominal affendages ^ell deveU^ed,^ 

 used for swimming. . 4 



bf tlie three tribes which compose this suborder, the Penaeidea ^näStenopidea' 

 a»ree in having the fl..t three pairs of legs chelate (with a few exoeptions m the 

 P„««-«,a,/the side-plates „f the second aHonunal — ^not expand^d ; ^he. 



legs is mucli larger than the 

 first in the Stenopidea, but not 

 in the Penaeidea. The Caridea 

 never have the third pair of 

 legs chelate, and have the 

 side-plates of the second ab- 

 dominal somite expanded to 

 ^ overlap those of the somites 



Fio. 1474. in front and behind. 



Peuaeus meyeri Oppel. Upper Jura (Lithographie Stone) ; The Penaeidea are SOme- 



Solenhofen. 1/2. ^j^^^ doubtfully represented 



in the Trias, but a long series of fossils from the Solenhofen Lithographie Stone can 

 be referred with certainty to this tribe. Some of these are inchided in the Kecent 

 genus Penaeus Fabricius (Fig. 1474), while Äcanthochirus Oppel, Bylgia, Drohna an^ 

 Dusa Münster are extinct genera. 



The Stenopidea comprise a small number of Recent forms which show some 



Bull. Soc. Geol. France, 1859, ser. 2, vol. xvu—Früsch, Ä., Über die Caliaiiassen der böhmischen 

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 Weissen Jura von Süddeutschland. Arch. Biontol., 1907, vol. ii. — Lörenthey, K, Über die Brachy- 

 uren der paläont. Sammlung des Bayer. Staates Termeszet Füzetek, Budapest, 1898, vol. xxi. — 

 Idem, Beiträge zur Decapodenfauna des ungarischen Tfertiärs. Math.-naturw. Ber. aus Ungarn, 

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 vol. xxi. — Idem, Beiträge zur tertiären Decapodenfauna Sardiniens und Ägyptens. Op. cit., 1908, 

 1909, vols. xxiv., XXV. — Mark, W. von der, Fossile Fische, Krebse und Pflanzen aus der Kreide. 

 Palaeontogr., 1863, vol. xi. — Idem, and Schlüter, C, Neue Fische und Krebse aus der Kreide von 

 Westphalen. Op.ciL, 1868, vol. xv. — Meyer, H. von, Neue Gattungen fossiler Krebse. Stuttgart, 

 1840. — Moericke, W., Die Crustaceen der Stramberger Schichten. Palaeontogr., 1897, Supplem. 

 vol. ii. — Oppel, A., Ueber jurassische Crustaceen. Palaeont. Mittheil. Mus. Bayer. Staates, 1862, 

 vol. ii. — Ortmann, A. E., On Limiparus in the Upper Cretaceous of Dakota. Anier. Journ. Sei., 

 1897, ser. 4, vol. iv. — Pilshry, H. A., Crustacea of the Cretaceous formation of New Jersey. 

 Proc. Acad. Nat. Sei. Philad., 1901, vol. in.— Rathhun, M. J., Descriptions of fossil crabs from 

 California. Proc. U.S. Nat. Mus., 1908, vol. xxxv. — Schlüter, C, Die Macruren-Decapoden 

 Westphalens. Zeitschr. Deutsch. Geol. Ges., 1862, vol. xiv.— Idem, Kreide- und Tertiär-Krebse des 

 nördlichen Deutschlands. Op. cit., 1879, vol. xxxi. — Idem, Podocrates im Senon von 

 Braunschweig. Op. cit., 1899, vol. W.—Stimpson, W., Fossil Crab from Gay Head. Journ. 

 Boston Soc. Nat. Hist., 1863, vol. vii. — Tribolet, M., Descriptions des crustacees du terrain 

 neocomien. Bull. Soc. Geol. France, 1874-75, ser. 3, vols. ii., in. — Whitfield, R. F., American 

 species of /yo2?Zq/?aria. Bull. Anier. Mus. Nat. Hist., 1907, vol. xxiii. — H^mÄ;Zer, T. C, Etudes sur 

 les genres Pemphix, Glyphaea, etc. Arch. Mus. Teyler, 1883, ser. 2, vol. i.~Woodward, H., 

 Macrurous Crustacea, etc. Quart. Journ. Geol. Soc, 1872-76, vols. xxix., xxxii. 



